Quote Originally Posted by EBP_EM1
true.. i was wondering if i should have said 2000.

never polished an intake manifold before but i have polished floorboards on my old 74 VW beetle.
yeah...

to tell ya the truth, if you're using that bench grinder, you could probably stop after 600-800 w/ the sand paper. as long as the metal is smooth, the scratches will buff themselves out